[linux-2.6-block.git] / fs / udf / file.c

/*
 * file.c
 *
 * PURPOSE
 *  File handling routines for the OSTA-UDF(tm) filesystem.
 *
 * COPYRIGHT
 *  This file is distributed under the terms of the GNU General Public
 *  License (GPL). Copies of the GPL can be obtained from:
 *    ftp://prep.ai.mit.edu/pub/gnu/GPL
 *  Each contributing author retains all rights to their own work.
 *
 *  (C) 1998-1999 Dave Boynton
 *  (C) 1998-2004 Ben Fennema
 *  (C) 1999-2000 Stelias Computing Inc
 *
 * HISTORY
 *
 *  10/02/98 dgb  Attempt to integrate into udf.o
 *  10/07/98      Switched to using generic_readpage, etc., like isofs
 *                And it works!
 *  12/06/98 blf  Added udf_file_read. uses generic_file_read for all cases but
 *                ICBTAG_FLAG_AD_IN_ICB.
 *  04/06/99      64 bit file handling on 32 bit systems taken from ext2 file.c
 *  05/12/99      Preliminary file write support
 */

#include "udfdecl.h"
#include <linux/fs.h>
#include <linux/udf_fs.h>
#include <asm/uaccess.h>
#include <linux/kernel.h>
#include <linux/string.h> /* memset */
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/smp_lock.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>

#include "udf_i.h"
#include "udf_sb.h"

static int udf_adinicb_readpage(struct file *file, struct page * page)
{
	struct inode *inode = page->mapping->host;
	char *kaddr;

	BUG_ON(!PageLocked(page));

	kaddr = kmap(page);
	memset(kaddr, 0, PAGE_CACHE_SIZE);
	memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
	flush_dcache_page(page);
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);
	return 0;
}

static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc)
{
	struct inode *inode = page->mapping->host;
	char *kaddr;

	BUG_ON(!PageLocked(page));

	kaddr = kmap(page);
	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
	mark_inode_dirty(inode);
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);
	return 0;
}

static int udf_adinicb_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
{
	kmap(page);
	return 0;
}

static int udf_adinicb_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
{
	struct inode *inode = page->mapping->host;
	char *kaddr = page_address(page);

	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
		kaddr + offset, to - offset);
	mark_inode_dirty(inode);
	SetPageUptodate(page);
	kunmap(page);
	/* only one page here */
	if (to > inode->i_size)
		inode->i_size = to;
	return 0;
}

struct address_space_operations udf_adinicb_aops = {
	.readpage		= udf_adinicb_readpage,
	.writepage		= udf_adinicb_writepage,
	.sync_page		= block_sync_page,
	.prepare_write		= udf_adinicb_prepare_write,
	.commit_write		= udf_adinicb_commit_write,
};

static ssize_t udf_file_write(struct file * file, const char __user * buf,
	size_t count, loff_t *ppos)
{
	ssize_t retval;
	struct inode *inode = file->f_dentry->d_inode;
	int err, pos;

	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
	{
		if (file->f_flags & O_APPEND)
			pos = inode->i_size;
		else
			pos = *ppos;

		if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
			pos + count))
		{
			udf_expand_file_adinicb(inode, pos + count, &err);
			if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
			{
				udf_debug("udf_expand_adinicb: err=%d\n", err);
				return err;
			}
		}
		else
		{
			if (pos + count > inode->i_size)
				UDF_I_LENALLOC(inode) = pos + count;
			else
				UDF_I_LENALLOC(inode) = inode->i_size;
		}
	}

	retval = generic_file_write(file, buf, count, ppos);

	if (retval > 0)
		mark_inode_dirty(inode);
	return retval;
}

/*
 * udf_ioctl
 *
 * PURPOSE
 *	Issue an ioctl.
 *
 * DESCRIPTION
 *	Optional - sys_ioctl() will return -ENOTTY if this routine is not
 *	available, and the ioctl cannot be handled without filesystem help.
 *
 *	sys_ioctl() handles these ioctls that apply only to regular files:
 *		FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
 *	These ioctls are also handled by sys_ioctl():
 *		FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
 *	All other ioctls are passed to the filesystem.
 *
 *	Refer to sys_ioctl() in fs/ioctl.c
 *	sys_ioctl() -> .
 *
 * PRE-CONDITIONS
 *	inode			Pointer to inode that ioctl was issued on.
 *	filp			Pointer to file that ioctl was issued on.
 *	cmd			The ioctl command.
 *	arg			The ioctl argument [can be interpreted as a
 *				user-space pointer if desired].
 *
 * POST-CONDITIONS
 *	<return>		Success (>=0) or an error code (<=0) that
 *				sys_ioctl() will return.
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 */
int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
	unsigned long arg)
{
	int result = -EINVAL;

	if ( file_permission(filp, MAY_READ) != 0 )
	{
		udf_debug("no permission to access inode %lu\n",
						inode->i_ino);
		return -EPERM;
	}

	if ( !arg )
	{
		udf_debug("invalid argument to udf_ioctl\n");
		return -EINVAL;
	}

	switch (cmd)
	{
		case UDF_GETVOLIDENT:
			return copy_to_user((char __user *)arg,
				UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
		case UDF_RELOCATE_BLOCKS:
		{
			long old, new;

			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
			if (get_user(old, (long __user *)arg)) return -EFAULT;
			if ((result = udf_relocate_blocks(inode->i_sb,
					old, &new)) == 0)
				result = put_user(new, (long __user *)arg);

			return result;
		}
		case UDF_GETEASIZE:
			result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
			break;

		case UDF_GETEABLOCK:
			result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
				UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
			break;
	}

	return result;
}

/*
 * udf_release_file
 *
 * PURPOSE
 *  Called when all references to the file are closed
 *
 * DESCRIPTION
 *  Discard prealloced blocks
 *
 * HISTORY
 *
 */
static int udf_release_file(struct inode * inode, struct file * filp)
{
	if (filp->f_mode & FMODE_WRITE)
	{
		lock_kernel();
		udf_discard_prealloc(inode);
		unlock_kernel();
	}
	return 0;
}

struct file_operations udf_file_operations = {
	.read			= generic_file_read,
	.ioctl			= udf_ioctl,
	.open			= generic_file_open,
	.mmap			= generic_file_mmap,
	.write			= udf_file_write,
	.release		= udf_release_file,
	.fsync			= udf_fsync_file,
	.sendfile		= generic_file_sendfile,
};

struct inode_operations udf_file_inode_operations = {
	.truncate		= udf_truncate,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* file.c
	3	*
	4	* PURPOSE
	5	* File handling routines for the OSTA-UDF(tm) filesystem.
	6	*
1da177e4 LT	7	* COPYRIGHT
	8	* This file is distributed under the terms of the GNU General Public
	9	* License (GPL). Copies of the GPL can be obtained from:
	10	* ftp://prep.ai.mit.edu/pub/gnu/GPL
	11	* Each contributing author retains all rights to their own work.
	12	*
	13	* (C) 1998-1999 Dave Boynton
	14	* (C) 1998-2004 Ben Fennema
	15	* (C) 1999-2000 Stelias Computing Inc
	16	*
	17	* HISTORY
	18	*
	19	* 10/02/98 dgb Attempt to integrate into udf.o
	20	* 10/07/98 Switched to using generic_readpage, etc., like isofs
	21	* And it works!
	22	* 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but
	23	* ICBTAG_FLAG_AD_IN_ICB.
	24	* 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c
	25	* 05/12/99 Preliminary file write support
	26	*/
	27
	28	#include "udfdecl.h"
	29	#include <linux/fs.h>
	30	#include <linux/udf_fs.h>
	31	#include <asm/uaccess.h>
	32	#include <linux/kernel.h>
	33	#include <linux/string.h> /* memset */
16f7e0fe	34	#include <linux/capability.h>
1da177e4 LT	35	#include <linux/errno.h>
	36	#include <linux/smp_lock.h>
	37	#include <linux/pagemap.h>
	38	#include <linux/buffer_head.h>
	39
	40	#include "udf_i.h"
	41	#include "udf_sb.h"
	42
	43	static int udf_adinicb_readpage(struct file file, struct page page)
	44	{
	45	struct inode *inode = page->mapping->host;
	46	char *kaddr;
	47
cd7619d6	48	BUG_ON(!PageLocked(page));
1da177e4 LT	49
	50	kaddr = kmap(page);
	51	memset(kaddr, 0, PAGE_CACHE_SIZE);
	52	memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
	53	flush_dcache_page(page);
	54	SetPageUptodate(page);
	55	kunmap(page);
	56	unlock_page(page);
	57	return 0;
	58	}
	59
	60	static int udf_adinicb_writepage(struct page page, struct writeback_control wbc)
	61	{
	62	struct inode *inode = page->mapping->host;
	63	char *kaddr;
	64
cd7619d6	65	BUG_ON(!PageLocked(page));
1da177e4 LT	66
	67	kaddr = kmap(page);
	68	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
	69	mark_inode_dirty(inode);
	70	SetPageUptodate(page);
	71	kunmap(page);
	72	unlock_page(page);
	73	return 0;
	74	}
	75
	76	static int udf_adinicb_prepare_write(struct file file, struct page page, unsigned offset, unsigned to)
	77	{
	78	kmap(page);
	79	return 0;
	80	}
	81
	82	static int udf_adinicb_commit_write(struct file file, struct page page, unsigned offset, unsigned to)
	83	{
	84	struct inode *inode = page->mapping->host;
	85	char *kaddr = page_address(page);
	86
	87	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
	88	kaddr + offset, to - offset);
	89	mark_inode_dirty(inode);
	90	SetPageUptodate(page);
	91	kunmap(page);
	92	/* only one page here */
	93	if (to > inode->i_size)
	94	inode->i_size = to;
	95	return 0;
	96	}
	97
	98	struct address_space_operations udf_adinicb_aops = {
	99	.readpage = udf_adinicb_readpage,
	100	.writepage = udf_adinicb_writepage,
	101	.sync_page = block_sync_page,
	102	.prepare_write = udf_adinicb_prepare_write,
	103	.commit_write = udf_adinicb_commit_write,
	104	};
	105
	106	static ssize_t udf_file_write(struct file * file, const char __user * buf,
	107	size_t count, loff_t *ppos)
	108	{
	109	ssize_t retval;
	110	struct inode *inode = file->f_dentry->d_inode;
	111	int err, pos;
	112
	113	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
	114	{
	115	if (file->f_flags & O_APPEND)
	116	pos = inode->i_size;
	117	else
	118	pos = *ppos;
	119
	120	if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
	121	pos + count))
	122	{
	123	udf_expand_file_adinicb(inode, pos + count, &err);
	124	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
	125	{
	126	udf_debug("udf_expand_adinicb: err=%d\n", err);
	127	return err;
	128	}
	129	}
130	else
131	{
132	if (pos + count > inode->i_size)
133	UDF_I_LENALLOC(inode) = pos + count;
134	else
135	UDF_I_LENALLOC(inode) = inode->i_size;
136	}
137	}
138
139	retval = generic_file_write(file, buf, count, ppos);
140
141	if (retval > 0)
142	mark_inode_dirty(inode);
143	return retval;
144	}
145
146	/*
147	* udf_ioctl
148	*
149	* PURPOSE
150	* Issue an ioctl.
151	*
152	* DESCRIPTION
153	* Optional - sys_ioctl() will return -ENOTTY if this routine is not
154	* available, and the ioctl cannot be handled without filesystem help.
155	*
156	* sys_ioctl() handles these ioctls that apply only to regular files:
157	* FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
158	* These ioctls are also handled by sys_ioctl():
159	* FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
160	* All other ioctls are passed to the filesystem.
161	*
162	* Refer to sys_ioctl() in fs/ioctl.c
163	* sys_ioctl() -> .
164	*
165	* PRE-CONDITIONS
166	* inode Pointer to inode that ioctl was issued on.
167	* filp Pointer to file that ioctl was issued on.
168	* cmd The ioctl command.
169	* arg The ioctl argument [can be interpreted as a
170	* user-space pointer if desired].
171	*
172	* POST-CONDITIONS
173	* <return> Success (>=0) or an error code (<=0) that
174	* sys_ioctl() will return.
175	*
176	* HISTORY
177	* July 1, 1997 - Andrew E. Mileski
178	* Written, tested, and released.
179	*/
180	int udf_ioctl(struct inode inode, struct file filp, unsigned int cmd,
181	unsigned long arg)
182	{
183	int result = -EINVAL;
184
8c744fb8	185	if ( file_permission(filp, MAY_READ) != 0 )
1da177e4 LT	186	{
	187	udf_debug("no permission to access inode %lu\n",
	188	inode->i_ino);
	189	return -EPERM;
	190	}
	191
	192	if ( !arg )
	193	{
	194	udf_debug("invalid argument to udf_ioctl\n");
	195	return -EINVAL;
	196	}
	197
	198	switch (cmd)
	199	{
	200	case UDF_GETVOLIDENT:
	201	return copy_to_user((char __user *)arg,
	202	UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
	203	case UDF_RELOCATE_BLOCKS:
	204	{
	205	long old, new;
	206
	207	if (!capable(CAP_SYS_ADMIN)) return -EACCES;
	208	if (get_user(old, (long __user *)arg)) return -EFAULT;
	209	if ((result = udf_relocate_blocks(inode->i_sb,
	210	old, &new)) == 0)
	211	result = put_user(new, (long __user *)arg);
	212
	213	return result;
	214	}
	215	case UDF_GETEASIZE:
	216	result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
	217	break;
	218
	219	case UDF_GETEABLOCK:
	220	result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
	221	UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
	222	break;
	223	}
	224
	225	return result;
	226	}
	227
	228	/*
	229	* udf_release_file
	230	*
	231	* PURPOSE
	232	* Called when all references to the file are closed
	233	*
	234	* DESCRIPTION
	235	* Discard prealloced blocks
	236	*
	237	* HISTORY
	238	*
	239	*/
	240	static int udf_release_file(struct inode * inode, struct file * filp)
	241	{
	242	if (filp->f_mode & FMODE_WRITE)
	243	{
	244	lock_kernel();
	245	udf_discard_prealloc(inode);
	246	unlock_kernel();
	247	}
	248	return 0;
	249	}
250
251	struct file_operations udf_file_operations = {
252	.read = generic_file_read,
253	.ioctl = udf_ioctl,
254	.open = generic_file_open,
255	.mmap = generic_file_mmap,
256	.write = udf_file_write,
257	.release = udf_release_file,
258	.fsync = udf_fsync_file,
259	.sendfile = generic_file_sendfile,
260	};
261
262	struct inode_operations udf_file_inode_operations = {
263	.truncate = udf_truncate,
264	};